{"product_id":"oem-goodman-m4-primary-limit-switch-for-amh80704bxcb-furnace-20162906","title":"OEM Goodman M4 Primary Limit Switch for AMH80704BXCB Furnace — 20162906","description":"\u003cp\u003eThe Goodman \u003cstrong\u003e20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM high-limit control for the \u003cstrong\u003eAMH80704BXCB\u003c\/strong\u003e gas furnace. Mounted on the heat-exchanger bulkhead, the primary limit continuously senses supply-air temperature and shuts off the burners if the furnace overheats — typically due to a dirty filter, blocked ductwork, or blower failure. It is the furnace's main line of defense against heat-exchanger damage.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: M4 primary high-limit switch (auto-reset)\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: 20162906\u003c\/li\u003e\n\u003cli\u003eFits: Goodman \u0026amp; Amana AMH80704BXCB and compatible furnaces\u003c\/li\u003e\n\u003cli\u003eFunction: Opens burner circuit on supply-air overheat\u003c\/li\u003e\n\u003cli\u003eReset: Automatic on cool-down\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe OEM 20162906 is set to the exact cut-out temperature specified for this furnace's cabinet and airflow design. A generic limit with a different trip point can cause repeated nuisance lockouts or allow damaging temperatures to build. For a primary safety control, the genuine part is the reliable choice.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy — DIY friendly (10–15 minutes).\u003c\/strong\u003e Cut power, disconnect the two wires, remove the mounting screws, and install the replacement in the same orientation. No gas or refrigerant work involved. Always confirm the furnace disconnect is off before servicing.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057614111091,"sku":"GOODMAN-20162906","price":22.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-amh80704bxcb-furnace-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}